Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Does it cool at all? What exactly is it doing?
does it work better if you are driving above 55 or so?
If it works good at cruising speeds, and not so well at a stand still, then I would agree with you totally. Although it might seem ok, the fan clutch is likely the problem. I would wash the condenser really good and make sure it's not plugged up with bugs, dirt etc. If and when that doesn't cure the problem I would replace the fan clutch.
also make sure the radiator is clean too. when your not moving, the fan has to push the air through the radiator to get to the condenser. Im sure you knew that, but it was worth mentioning
a properly functioning ac system should cool more when the condenser is hosed off. what is the outside temperature right now where your at, and is your system r12 or has it been converted to 134a? can you put a thermometer in one of the vents and tell me what the temp is with the ac on?
15 ounces of 134a? it should have 2.8lbs
i can't see it cooling at all with 15oz of freon. even hosing down the condenser. I will opt out. hopefully somebody else has a better idea
wait, before I go, how did you determine that it only has 15oz of freon? the compressor shouldn't even cycle on at that point. Did you use a calibrated evac/recharge machine?
just to make sure i am understanding correctly, you have made sure the condenser and radiator are clean, and you have installed the OE fan and fan clutch and still this continues to be a problem? There has to be either a restriction in the high side of your ac system, or not enough air movement through the condenser since you have replaced the oriface tube i am leaning toward too little air movement
well, i really wish I had an answer, but if your sure that the fans are moving enough air through the condenser, and that there is no blockage and that it's not over charged (which it would not be at less than a lb) then i am out of ideas without it being in front of me. Im probably missing something.
New expert here did you still need help ?
2 things that i am curious about
1 ) is there 2.8 LBS of refrigerant in the system or 44.8 OZ ?
did you add any oil ?
2 ) is the stock fan shroud upper and lower still on the truck correctly ?
did you say you tried another fan blade and clutch fan ?
this has all the signs of an air flow problem from the fan not drawing enough air across the condenser and radiator fins
it has to be as if you use water on the condenser the pressure drops right down
how far when the clutch fan and oem blade into the shroud and how far from the radiator ?
was the fan clutch you tried brand new ? what did the blade come out of ?
again when it will drop down that fast when cooled there is not enough air being drawn through the fins
when at idle and the ac on that clutch fan should be almost roaring being fully locked
ok i wanted to be sure the fan blade and clutch were in far enough of the shroud
did this ac ever work fine with the flex fan in place ?
and the fan in front is pushing air through the fins ?
brand new orifice tube filter installed and installed correctly ?
as long as it has a new orifice tube the one that slides into the condenser port
is there anyway to fine out when the last time this ac system worked ?
can you be sure the fan in front of the radiator is pushing air into the engine compartment direction of air flow
we ca see if another expert has any more ideas
hang on another expert will reply back to you
im sorry i could not help
Hi, My name is ***** ***** for the delay.
I will do my best to assist you
ok,,from the beginning here..
tell me,,right now how much pressure do you have on the low side with the a/c on at an idle?
why did you replace the compressor?
ok,the condenser,orifice,and dryer are new?and you flushed the system?
also,tell me,how much 134 did you put into the system.this was originally a r12 system,,right
you say there was medal in the orifice?please explain.
did the a/c work before the work was done?
31 Aug 2015, 9:27 PM
31 Aug 2015, 9:28 PM
are you there?
you arent talking to me
ok,,here is what i want you to do,,i want you to blow the system and start all over
get the 134a outa there and start over
i want you to put 37.5 oz in the system after you vacuum
134 expands at 20% more than r12
meaning that an oz of 134 is nore than an oz of r12
im not worried about the pressures at the moment,,it isnt gong to work with it half full
what fan are you using now??still have the electric fan on it?
on the condenser.
does it have a fan shroud on it?
ok,,i really needs the clutch
it will pull more air at an idle
do you have the system dried out yet?
if it doesnt work after you recharge it with 37.5 oz and the orifice,condenser and the dryer is new,...
i want you to replace that compressor,,i
i would think some of the medal you found in the orfice made its way to the new compressor or it just isnt good
again,,install the clutch fan ,put in 37.5 oz
i that compressor is good,,it will work
still yet,,if you put 37.5oz in the system with the clutch fan it will work,if not,replace that compressor
if it gets too high it will blow out,,i look for the pressures to drop
if not,,we know the system is clogged,,,you have a new orifice,condenser and dryer,,if it doesnt work,,the compressor is the problem,,there isnt anything else left
it isnt going to work half full
i would like for you to start over to make sure you vacuum the system well so we know there is no dampness in it,,to rule out a freeze up problem
by the way,,the 134 is not going to cool as good as the r12 anyways..but,,it should be cold
let me know how it gos
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if you put the 37.5 oz in it an sense all is new,,i would think that pump is no good
ok..let me know,,,
you said you installed a new condenser..correct?
how much 134 do you have in it this time?
this isnt making allot of sense,,it does sound like a bad condenser,,but,you have already replaced it.